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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611955b06f39fbb9ad366062a63db4a80969042c1c849aaabe8fa34568c27a3c' 
  AND token = 'DFyRBU3ggsTkAp3fakx7bu8MMrNJ69AwcUgljbKq5+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}